On our trip over Memorial Day weekend: we had the rig plugged in at home for a couple of days, with the Fridge set to run on electricity.
Before leaving for the trip: we manually switched it over to propane for the drive up there (about three and a half hours...).
Once there: we switched it back over to electricity, once we plugged into shore power...
Everything stayed nice and cold, and it gave me a chance to push some buttons!